diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 439ccff10..8a498fcf2 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -15,14 +15,14 @@ jobs:
 
     strategy:
       matrix:
-        otp_version: [23, 24, 25.0]
+        otp_version: [24, 25.0, 26]
         os: [ubuntu-latest]
 
     container:
       image: erlang:${{ matrix.otp_version }}
 
     env:
-      LATEST_OTP_RELEASE: 25.0
+      LATEST_OTP_RELEASE: 26.0
 
     steps:
     - uses: actions/checkout@v2
diff --git a/.github/workflows/nightly.yml b/.github/workflows/nightly.yml
index 7a0ecbc9d..e660b4e0d 100644
--- a/.github/workflows/nightly.yml
+++ b/.github/workflows/nightly.yml
@@ -15,7 +15,7 @@ jobs:
 
     - uses: erlef/setup-beam@v1
       with:
-          otp-version: '23.3.4.14'
+          otp-version: '24'
     - name: Compile
       run: ./bootstrap
     - name: CT tests
diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
index 9d8eb0d33..292e5b3dd 100644
--- a/.github/workflows/publish.yml
+++ b/.github/workflows/publish.yml
@@ -15,7 +15,7 @@ jobs:
 
     - uses: erlef/setup-beam@v1
       with:
-          otp-version: '23.3.4.14'
+          otp-version: '24'
     - name: Compile
       run: ./bootstrap
     - name: CT tests
diff --git a/.github/workflows/shelltests.yml b/.github/workflows/shelltests.yml
index d98cba81a..418326743 100644
--- a/.github/workflows/shelltests.yml
+++ b/.github/workflows/shelltests.yml
@@ -15,8 +15,8 @@ jobs:
     - uses: actions/checkout@v2
     - uses: erlef/setup-beam@v1
       with:
-          otp-version: '25.0'
-          elixir-version: '1.13'
+          otp-version: '26.0'
+          elixir-version: '1.14'
     - name: Compile
       run: ./bootstrap
     - name: Install
diff --git a/README.md b/README.md
index f6c4f9203..93f8b0816 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # Rebar3
 
-[![Build Status](https://github.com/erlang/rebar3/workflows/Common%20Test/badge.svg)](https://github.com/erlang/rebar3/actions?query=branch%3Amaster+workflow%3A"Common+Test") [![Erlang Versions](https://img.shields.io/badge/Supported%20Erlang%2FOTP-23.0%20to%2025.0-blue)](http://www.erlang.org)
+[![Build Status](https://github.com/erlang/rebar3/workflows/Common%20Test/badge.svg)](https://github.com/erlang/rebar3/actions?query=branch%3Amaster+workflow%3A"Common+Test") [![Erlang Versions](https://img.shields.io/badge/Supported%20Erlang%2FOTP-24.0%20to%2026.0-blue)](http://www.erlang.org)
 
 1. [What is Rebar3?](#what-is-rebar3)
 2. [Why Rebar3?](#why-rebar3)
@@ -94,7 +94,7 @@ by [Erlang Solutions](https://www.erlang-solutions.com/resources/download.html),
 but be sure to choose the "Standard" download option or you'll have issues building
 projects.
 
-Do note that if you are planning to work with multiple Erlang versions on the same machine, you will want to build Rebar3 with the oldest one of them. The 3 newest major Erlang releases are supported at any given time: if the newest version is OTP-24, building with versions as old as OTP-22 will be supported, and produce an executable that will work with those that follow.
+Do note that if you are planning to work with multiple Erlang versions on the same machine, you will want to build Rebar3 with the oldest one of them. The 3 newest major Erlang releases are supported at any given time: if the newest version is OTP-26, building with versions as old as OTP-24 will be supported, and produce an executable that will work with those that follow.
 
 ## Documentation
 
diff --git a/rebar.config b/rebar.config
index b62147419..77f492a87 100644
--- a/rebar.config
+++ b/rebar.config
@@ -30,7 +30,8 @@
     {dialyzer, [
         {erl_opts, [debug_info, nowarn_export_all]},
         %% Ignore deps known to generate warnings
-        {dialyzer, [{exclude_apps, [cth_readable, erlware_commons, relx]}]}
+        {dialyzer, [{warnings, [no_unknown]},
+                    {exclude_apps, [cth_readable, erlware_commons, relx]}]}
     ]},
     %% Duplicated from apps/rebar3:
     %% - we don't want the test profile applied to our vendored deps.